зеркало из https://github.com/github/ruby.git
147 строки
3.8 KiB
C
147 строки
3.8 KiB
C
/**
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* @file pm_buffer.h
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*
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* A wrapper around a contiguous block of allocated memory.
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*/
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#ifndef PRISM_BUFFER_H
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#define PRISM_BUFFER_H
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#include "prism/defines.h"
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#include <assert.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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/**
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* A pm_buffer_t is a simple memory buffer that stores data in a contiguous
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* block of memory.
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*/
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typedef struct {
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/** The length of the buffer in bytes. */
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size_t length;
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/** The capacity of the buffer in bytes that has been allocated. */
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size_t capacity;
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/** A pointer to the start of the buffer. */
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char *value;
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} pm_buffer_t;
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/**
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* Return the size of the pm_buffer_t struct.
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*
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* @returns The size of the pm_buffer_t struct.
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*/
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PRISM_EXPORTED_FUNCTION size_t pm_buffer_sizeof(void);
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/**
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* Initialize a pm_buffer_t with the given capacity.
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*
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* @param buffer The buffer to initialize.
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* @param capacity The capacity of the buffer.
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* @returns True if the buffer was initialized successfully, false otherwise.
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*/
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bool pm_buffer_init_capacity(pm_buffer_t *buffer, size_t capacity);
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/**
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* Initialize a pm_buffer_t with its default values.
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*
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* @param buffer The buffer to initialize.
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* @returns True if the buffer was initialized successfully, false otherwise.
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*/
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PRISM_EXPORTED_FUNCTION bool pm_buffer_init(pm_buffer_t *buffer);
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/**
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* Return the value of the buffer.
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*
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* @param buffer The buffer to get the value of.
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* @returns The value of the buffer.
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*/
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PRISM_EXPORTED_FUNCTION char * pm_buffer_value(pm_buffer_t *buffer);
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/**
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* Return the length of the buffer.
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*
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* @param buffer The buffer to get the length of.
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* @returns The length of the buffer.
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*/
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PRISM_EXPORTED_FUNCTION size_t pm_buffer_length(pm_buffer_t *buffer);
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/**
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* Append the given amount of space as zeroes to the buffer.
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*
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* @param buffer The buffer to append to.
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* @param length The amount of space to append and zero.
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*/
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void pm_buffer_append_zeroes(pm_buffer_t *buffer, size_t length);
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/**
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* Append a formatted string to the buffer.
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*
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* @param buffer The buffer to append to.
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* @param format The format string to append.
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* @param ... The arguments to the format string.
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*/
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void pm_buffer_append_format(pm_buffer_t *buffer, const char *format, ...) PRISM_ATTRIBUTE_FORMAT(2, 3);
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/**
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* Append a string to the buffer.
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*
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* @param buffer The buffer to append to.
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* @param value The string to append.
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* @param length The length of the string to append.
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*/
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void pm_buffer_append_string(pm_buffer_t *buffer, const char *value, size_t length);
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/**
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* Append a list of bytes to the buffer.
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*
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* @param buffer The buffer to append to.
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* @param value The bytes to append.
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* @param length The length of the bytes to append.
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*/
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void pm_buffer_append_bytes(pm_buffer_t *buffer, const uint8_t *value, size_t length);
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/**
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* Append a single byte to the buffer.
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*
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* @param buffer The buffer to append to.
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* @param value The byte to append.
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*/
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void pm_buffer_append_byte(pm_buffer_t *buffer, uint8_t value);
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/**
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* Append a 32-bit unsigned integer to the buffer as a variable-length integer.
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*
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* @param buffer The buffer to append to.
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* @param value The integer to append.
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*/
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void pm_buffer_append_varuint(pm_buffer_t *buffer, uint32_t value);
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/**
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* Append a 32-bit signed integer to the buffer as a variable-length integer.
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*
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* @param buffer The buffer to append to.
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* @param value The integer to append.
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*/
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void pm_buffer_append_varsint(pm_buffer_t *buffer, int32_t value);
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/**
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* Concatenate one buffer onto another.
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*
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* @param destination The buffer to concatenate onto.
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* @param source The buffer to concatenate.
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*/
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void pm_buffer_concat(pm_buffer_t *destination, const pm_buffer_t *source);
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/**
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* Free the memory associated with the buffer.
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*
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* @param buffer The buffer to free.
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*/
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PRISM_EXPORTED_FUNCTION void pm_buffer_free(pm_buffer_t *buffer);
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#endif
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